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At this point, it is very clear that both M5 and M6 are going to make proud owners out of anyone aside from personal preferences, especially after seeing and hearing reports from people who have driven both.

In my opinion, automobiles are just automobiles which are chunk of metals unless we have our experiences with them; and our experiences come from our perception of beauty, power, comfort etc.

While I have loved the styling of 6-Series/M6 and have had great time cruising around with my lovely wife in our 645 CiC, I am trying to find a way to get both M5 and M6 into my garage.

I have accomplished my first step now. As of yesterday, my order for the M6 is in the system!!

"I am looking forward to taking the delivery of our M6" would be a complete understatement to say the least!!

Now I have got to figure out the way to get the rest of my wish list done......and having a great time while doing it!!

I think you might be the only person in the country to have an m5 and m6 if you are able to swing it. God Bless You.

I had both the E60 M5 and now have the E63 M6. I loved my experience with M5 ( had it 6 months)...But there is significant difference between the 2. Not so much in acceleration ( although I recently race E60 M5 with my M6 on a well know NYC bridge ,approx 1/2 mile long) and beat it my a good 10 car lengths. The difference is in the stabilty and handing. It feels much tighter and quicker to accelerate than the M5. Dont get me wrong the m5 is definitely sick but im a coupe guy and honestly the price diference was not the 20k everyone says. After all the options my M5 came out to 99k and my M6 was 108k both fully loaded. Im a coupe guy...would love to get the Alpina B7 if I want sedan...

I think they are making less M6's than M5's, still, that doesn't really justify the price difference. What I think does though is that a standard 650i price vs 550i price, ~$15k.

What are you people talking about? Slight differences? The M6 is lighter, faster, lower center of gravity, handles better! Those are some major differences. If you dont believe me, go on youtube.com and search for videos called M5 vs. M6 and you will see for yourself. Those are all facts! Now for my opinion, the M6 is head and shoulders above the M5 in terms of styling and road presence.

I'd go for the M5, my reason being that four door sedan just shouldn't be that damn fast! Not sure if I'd consider it a sleeper, but that's one wicked four door. I'm under 30 with no kids and a 745i is what I have now, coupes just never did it for me. I envy all of you that actually need to make that choice versus hypothetically making that choice!

Caveat: I am an owner of a 2003 540i 6-speed and have driven the e39 m5.
I am of the opinion that both are awesome cars, and I love the look of the m6. However, I don't think neither qualifies as a sports car. For M6 kind of money, I would get a 997 GT3. So I think the M5 takes this one as the most bonkers production sedan.
I have to say, though, that after getting out on the track and trying out a few cars, I think Cayman will be my next car - mondo engines are great, but there is just no fooling physics in the turns. I now think the e46 M3 is too heavy .

I never understood the styling of the new 5 series ...quite frankly I found them ugly. No offense intended ...itst just a matter of personal taste. so if bought a 2007 M6 and have no regrets: Black, black, all options and windows tinted....it looks sinister....and is so much fun to drive.